Not quite. In the early days of motion pictures there were no
standards. Since both the camera and projector were hand cranked, each
film had it's own projection speed. To save on film costs, many early
movies were shot and projected as slow as 20 frames per second (and
sometimes even slower...) leading to the Brittish slang term for movies:
"flickers." Eventually, the projection speed was standardized at 24
frames per second -- this is still the standard today. 24 fps was
chosen because that is the speed at which a projected image does not
seem to flicker.
30 frames per second is the frame rate of television in North America,
but that rate has little to do with the physiology of vision, and more
to do with practical electronics (hint: the frequency of house current
in N. Amer. is 60 herz).
Mike Vande Bunt
Steve Bell wrote:
a little fact that may help:
when motion pictures/films were first being made, they were projected at
one frame every 30th of a second. this was the slowest the pictures could
move without the human eye detecting that it wasn't one, but many frames.
so my conclusion is that the slowest 'shutter speed' of the human eye is
1/30 sec. i'm sure that we have faster 'speeds' built in there somewhere.
cheers,
Steve
[Original Message]
From: George L Smyth <[email protected]>
To: <pinhole-discussion@p at ???????>
> Date: 1/5/2003 11:53:02 AM
Subject: Re: [pinhole-discussion] Human eye
On 22 Jul 2002, at 11:16, [email protected] wrote:
I know this is not strictly pinhole, but I wondered if
anyone had access to the average human eye values for the
camera variables. ie Respective - film speed, shutter speed,
aperture, focus range, depth of field etc. Thanks
Ellis
When I looked into shutter speed many years ago, I came upon the
conclusion
that the eye's shutter speed is approximately 1/100 second. You can
verify
this by taking successive pictures of a waterfall. We all know that
slowing
down the shutter speed to a second or more will make for silky water,
which is
not what we see. From there, take pictures with faster and faster speeds
(don't forget to take notes). When you get the results, compare the
pictures
with what you see and make the decision for yourself.
Cheers -
george
=====
Handmade Photographic Images - http://GLSmyth.com
DRiP Investing - http://DRiPInvesting.org
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--- Steve Bell
--- [email protected]
--- "We have...become our own thought police; but instead of calling the
process by which we limit our own expression of
dissent and wonder 'censorship', we call it 'concern for commercial
viability'." -David Mamet
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